Abstract
A novel temperature-independent gas pressure sensor based on a reflective fiber Lyot filter is presented in this paper. The reflective fiber Lyot filter is simply consist of a fiber polarizer and a segment of hollow-core photonic bandgap fiber (HB-PCF). The HB-PCF plays the role of birefringent cavity in the reflective fiber Lyot filter and works as the sensor head in the gas pressure sensor. Experiment results show that the responses of the sensor to gas pressure and temperature are 3.94 nm/MPa and −0.009 nm/°C, indicating that the proposed gas pressure is sensitive to gas pressure rather than temperature. Coupled with the advantages of simple structure, easy manufacture, high sensitivity and temperature independent, the proposed reflective fiber Lyot filter-based gas pressure sensor holds great potential application in the field of gas pressure monitoring.
Highlights
Gas pressure, as a physical parameter reflecting the force that the gas applies on the walls of its container, is an important parameter for ensuring the secure and efficient operation of various industrial equipment, including gas turbine, coal boilers, and so on
The high birefringence photonic crystal fiber (HB-PCF) exhibits an ultra-low thermal expansion coefficient because of its inherent air/silica microstructure cladding, which can reduce the temperature cross-sensitivity effectively [30], so the HB-PCF-based fiber sensor is a good candidate for gas pressure sensing
We propose and demonstrate a temperature-independent gas pressure sensor with high birefringence photonic crystal fiber-based reflective Lyot filter
Summary
As a physical parameter reflecting the force that the gas applies on the walls of its container, is an important parameter for ensuring the secure and efficient operation of various industrial equipment, including gas turbine, coal boilers, and so on. For the conventional birefringence fibers-based fiber sensors, when they are applied for other sensing instead of temperature, for instance, gas pressure, the inherently high temperature sensitivity induces serious cross-sensitivity, which severely limits their practical applications in gas pressure measurement. The high birefringence photonic crystal fiber (HB-PCF) exhibits an ultra-low thermal expansion coefficient because of its inherent air/silica microstructure cladding, which can reduce the temperature cross-sensitivity effectively [30], so the HB-PCF-based fiber sensor is a good candidate for gas pressure sensing. We propose and demonstrate a temperature-independent gas pressure sensor with high birefringence photonic crystal fiber-based reflective Lyot filter. Benefitting from the ultra-low thermal expansion coefficient of HB-PCF, the HB-PCF-based reflective Lyot filter overcomes the temperature cross-sensitivity faced by conventional birefringence fibers-based fiber sensors. All of the above experiment results confirm the good performance of the proposed reflective fiber Lyot filter-based gas pressure sensor
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